Preparation of a trans-calanolide ketone intermediate and chiral separation of calanolide alcohols to give racemic calanolide A
申请人:Dow Global Technologies Inc.
公开号:US06777562B1
公开(公告)日:2004-08-17
The method of the invention comprises a process for synthesizing a trans-calanolide A ketone intermediate used in the synthesis of racemic trans-calanolide A. The invention further comprises a method for removing a racemic calanolide B diastereomer from a mixture of calanolide A and calanolide B diastereomers formed in the last step of the synthesis of calanolide A by crystallization.
该发明的方法包括合成用于合成外消旋转异卡兰酯A的酮中间体的过程。该发明还包括一种通过结晶从卡兰酯A和卡兰酯B对映异构体的混合物中去除外消旋卡兰酯B对映异构体的方法,该混合物是在合成卡兰酯A的最后一步中形成的。